Owing to the impact of COVID-19, the study had to be withdrawn.

The Westlake Gut Microbiome study is a prospective cohort study. This project aims to characterize the gut microbiome among Chinese populations from different regions of China, and explore the relationships between gut microbiota and human health. Human fecal samples will be collected from the participants and muli-omics detection and analysis will be performed.

In the first phase of the study (also a pilot study), the investigators will create a longitudinal datasets from a students-based cohort in Westlake University. Information about demography, life style, diet, medical history, physical activity will be recorded, clinical examinations such as blood glucose, body composition and electroencephalogram will be examined, and biological samples including blood, saliva, urine and feces, will be collected.

In the second phase, the investigators will expand to include eligible participants from at least 10 provinces of China, which are located at different regions. Similar to the procedures in phase 1 stage, information about demography, life style, diet, medical history, physical activity will be recorded, clinical examinations will be performed, and biological samples will be collected.

Inclusion Criteria:

Participants or her/his legal guardian are able to report the antibiotics use during the past 3 months; Participants or her/his legal guardian are able to understand and respond to the online questionairs; Participants or her/his legal guardian are able and willing to collect the biological samples as instructed; Participants or her/his legal guardian are able and willing to provide written informed consent; -

Exclusion Criteria:

Those with serious fundamental diseases or infectious diseases; and those with other conditions that not suitable to participate in this study, as considered by the investigators.

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All the participants should be Chinese residents, regardless of the ethics.